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BM70A non-contact radar tide gauge

The Krohne BM70A radar sensor is a non-contact radar using FMCW (Frequency Modulated Continuous Wave) technology. This measurement technique is based on the frequency scanning principle. Here we measure a frequency difference that is directly linked to the distance between the sensor's reference and the surface measured. The BM70A uses an X-band microwave signal (around 10 GHz) which scans around 1 GHz. It is gradually being replaced by the new generation, OPTIWAVE 7300C. The Optiwave 7300C takes up less space, uses much less power and operates at a higher frequency, thus offering more advanced technical characteristics.

Tide gauge deployment

The BM70 is installed exclusively in small diameter (typically 80 mm) stainless steel stilling wells which serve both to physically filter the external swell and choppiness and to guide the radar wave.